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在十年动乱中,我校仪器设备损耗很多,到七八年春还只能做几个简单的演示实验,几年来,我们发扬自力更生的精神,坚持自己动手,就地取材,修旧利废,因陋就简,克服了设备缺乏,条件差的困难,开齐了高初中的演示实验和学生分组实验。一、改进实验方法、以达到定量实验精确度的要求“测定阿佛加德罗常数”和“测定溶解度曲线”两个定量实验,前者设备要求高,要用分析天平;后者是操作过程繁复的转移,费时且误差大。我们过去作测定阿佛加德罗常数实验,是辗转讬请有分析天平的单位代称硬脂酸,所用24厘米直径的玻璃水槽不合规格,结果各组测定的误差幅度很大。后来改用感量为0.1克的托盘天平,准确称量硬脂酸1.0克,配成100毫升苯溶液,再用滴管准确量取此硬脂酸苯溶液1.00毫升,再稀释成100毫升,备用,水槽用合规格的直径12厘米的培养皿代替,结果测定得到5.8×10~(23)～6.3×10~(23)的比较满意的效
During the ten years of turmoil, our school has a lot of equipment and equipment, and only a few simple demonstrations can be made in the spring and fall of 1978. In the past few years, we have taken the initiative in our own efforts to get the materials locally, Because of its simplicity, to overcome the lack of equipment, poor conditions, opened the high junior high school demonstration experiments and student group experiments. First, to improve the experimental methods in order to achieve quantitative experimental accuracy requirements “Determination of Avogadro's constant” and “determination of solubility curve” two quantitative experiments, the former equipment requirements are high, the analytical balance should be used; the latter is complicated operation process The transfer, time-consuming and error-prone. In the past, we used to measure the Avogadro constant experiment. After the experiment, the unit with analytical balance was called on behalf of stearic acid. The 24 cm diameter glass tank used was out of specification. As a result, the error of each group was very large. Later switched to a sense of the amount of 0.1 grams tray balance, accurate weighing 1.0 grams of stearic acid, dubbed 100 ml of benzene solution, and then the exact amount of this drop of stearic acid benzene solution 1.00 ml, and then diluted to 100 ml, Spare, sink with a qualified 12 cm diameter petri dishes instead, the results obtained 5.8 × 10 23 ~ 6.3 × 10 23 relatively satisfactory effect